Different voltages, different environmental protections, etc.
Different voltages: The working voltage and output voltage of nickel-metal hydride batteries are generally lower, generally 1.2-1.3V, and can replace 1.2V alkaline batteries. 5V. The working voltage and output voltage of lithium batteries are relatively high, and the cell voltage can generally reach 3.6V, which is three times that of ordinary nickel-metal hydride batteries.
Different environmental protection: Ni-MH batteries have no pollution to the environment, no memory effect and high safety performance. Lithium batteries do not present any particular advantages in terms of environmental protection.
The differences between nickel-metal-hydride and nickel-cadmium batteries:
The operating voltage of nickel-metal-hydride batteriesand nickel-cadmium is 1.2 V. However, the specific energy volume of nickel-metal hydride is higher than that of nickel-cadmium batteries. Depending on factors related to the battery manufacturing process, nickel-cadmium batteries have a strong memory effect, while nickel-hydrogen batteries have a very weak memory effect. At the same time, nickel-cadmium batteries contain the heavy metal cadmium, and their use is currently prohibited. However, due to the excellent high-rate discharge performance of nickel-cadmium batteries, nickel-metal hydride batteries cannot replace nickel-cadmium batteries in many power tools. Therefore, the ROSH standard temporarily allows the use of nickel-cadmium batteries in the field of power tools.
The difference between lithium batteries and nickel-metal hydride batteries:
Under the same volume, the battLithium eries have a larger capacity than nickel-metal hydride batteries, so their call and standby times are longer than nickel-metal hydride batteries. The price is also higher than nickel-metal hydride batteries. In addition, under normal circumstances, nickel-metal hydride batteries cannot be charged at any time, which greatly reduces their convenience.
The development of lithium-ion batteries began with lithium batteries and then developed to lithium-ion batteries. The first negative electrodes for lithium batteries used sheets of pure lithium. This type of lithium battery can easily catch fire and pose a danger. It is on this basis that lithium-ion batteries were developed. The negative electrode of lithium-ion batteries is made of graphite. The ionic conductor is made of lithium ions and not metallic lithium. The securityity is greatly improved.
The working voltage of the lithium-ion battery is 3.7 V. The specific energy volume is higher than that of nickel metal hydride. Currently, lithium-ion batteries are available in aluminum shells, steel shells and flexible packaging. occupy the market in their respective fields. Some markets are common, such as lithium batteries for cell phones.
However, since the operating voltage of previous disposable batteries and nickel-metal hydride batteries was 1.2 to 1.5 V, the two connected in series were 2.4 V to 3.0 V. Most electrical devices have already established this operating voltage standard. Such as a portable music player, radio, etc. Therefore, in the field of civilian batteries, lithium batteries cannot replace nickel-metal hydride batteries. However, new electrical appliancesLater developed products, such as MP3, MP4, etc., all use lithium batteries as mobile power sources.
Therefore, nickel-metal hydride, nickel-cadmium and lithium-ion batteries cannot be replaced by other batteries in their respective fields.